Mixing-machine.



Np. 891,876. PATENTED JUNE so, 1908, J. A. SVENSON.

MIXING MACHINE.

APPLIOATION FILED 00124, 1997.

2 SHEETS-SHEET 1.

n4: mmms PETERS co, WASHINGTON, 04 c.

PATENTED JUNE 30, 1908.

J. A. SVENSON. MIXING MACHINE.

AIPLIOATION FILED 00124, 1907.

2 SHEETS-SHEET 2- ZZZ/77559219.

THE NoRms PETERS co., WASHINGTON, D c.

UNITED STATES PATENT OFFICE...

JOHN A. SVENSON, OF PITTSBURG, PENNSYLVANIA.

MIXING-MACHINE.

Specification of Letters Patent.

Patented June 30, 1908.

Application filed October 24, 1907. Serial No. 398,883.

' In a common type of concrete mixer, the

mixing is done in a trough-like structure by means of paddles revolublysupported in said structure. At the end of each run it is necessary toclean out the concrete adhering to the inner walls of the trough, asotherwise said concrete would set within a short time and interfere withthe operation of the machine. Heretofore such cleaning has beendifficult and troublesome, especially in the lower portion of thetrough, to whichportion the mixing paddles prevent convenient access.

One of the objects of this invention is the provision of means forpermitting the mixing chamber of a mixing machine to be readily cleaned.In the present embodiment, which is a concrete mixer, I provide themixing trough with a bottom section arranged to be dropped into aninclined position and away from the paddles, thus rendering possible aconvenient and ra id cleaning of the trough.

The invention a so relates to the other improvements in mixing machineshereinafter set forth.

In the accompanying drawings Figure 1 is a side elevation of the rearend of a concrete mixer embodying the features of my invention. In thisview the parts are shown in the operative position. Fig. 2 is a sideelevation showing the parts in position for cleaning. Fig. 3 isalongitudinal central section through the rear end of the mixer. Fig. 4is a rear end elevation with the dumping gate omitted. Fig. 5 is. asection on the plane of dotted line 5 5 of Fig. 3.

An embodiment of my invention may comprise hoppers or other suitablereceptacles (not shown) in which the materials to be mixed are placed; amixing trough 1 in which said materials are thoroughly mixed; andv ascrew conveyer 2 for carrying the materials from the hoppers to themixing trough. It will be understood, however, that a conveyer is notessential, and that any suitable means may be employed for placing inthe trough 1 the materials to be mixed. The supporting framework of themachine comprises two frame members 3 and two inclined braces 4 securedat their lower ends to the member 3 and at their upper ends to the upperrear part of the mixing trough 1 at each side thereof. This form ofsupport for the mixing trough provides the space above ground and theoverhang necessary to permit of placing wheelbarrows beneath thedischarge end of the trough.

The mixing devices herein shown comprise a shaft 5 rotatably supportedat its rear end in a hanger 6 and continuously rotated by any suitablemeans. Said shaft carries a plurality of arms 7 provided at their outerends with paddles 8, the latter being set at an angle with the plane ofrotation so as to force the materials rearwardly in the mixing trough 1to the discharge end of said trough. A por-' tion of the mixing isperformed by the conveyer 2, and as the materials travel through thetrough 1 they are more intimately mixed until, when they reach the rearor discharge end of said trough, they are thoroughly com mingled and incondition to be used. The continuous or periodical discharge of themixed materials is controlled by a dumping gate 9, said gate beingpivotally supported at the rear end of the trough 1 and being providedwith one or more operating handles 10 by means of which it may be tiltedto permit the contents of the mixing trough to be discharged. Thedumping gate 9 is shaped so as to make a joint with the mixing trough 1.

The lower portion of the mixing trough 1 is preferably substantiallysemicylindrical to conform to the path of movement of the paddles 8. Topermit of readily cleaning out of the mixing trough at the end of eachrun, in order that the concrete adhering to the walls of the trough maynot harden, the mixing trough is made in two sections, the lower section11 being in this instance pivotally mounted in order that it may bedropped away from the paddles 8 into position for convenient cleaning.The bottom 11 is herein represented as pivotally supported at itsforward end upon a pivot rod 12 and is supported at its rear end bymeans of two hooks 13 adapted to engage the upper ends of the inclinedbraces 4. The lower ends of said hooks are screw threaded and passloosely through openings in the ends 14 of a strap 15 secured to thebottom.

Nuts 1 6 are turned on the ends of the hooks 13 below the ends 14 ofsaid strap. Plates 17 secured to the fixed upper section of the mixingtrough 1, one at each side thereof, provide means for guiding thepivoted bottom 11 to its place and close the joints between saidsections.

In operation, the materials are thoroughly mixed during their progressthrough the mixing trough 1, and are discharged from said troughperiodically or continuously, as may be desired, into wheelbarrows orother receptacles placed beneath the rear end of the trough. When it isdesirable to clean out the concrete adhering to the inner sides of themixing trough 1, the dumping gate 9 is opened and the upper ends of thehooks 13 are pushed outwardly off the upper ends of the inclined braces4. The bottom section 11 then drops into an inclined position as shownin Fig. 2. Because of itsinclined position and the abundance of spacethus provided beneath the paddles 8, the bottom 11 may now be quicklyand easily cleaned. After cleaning, the bottom is readily restored tooperative position and secured in such position by engaging the hooks 13with the upper ends of the braces'4.

It is apparent that various changes may be made in the construction andarrangement of the parts herein shown without departing from the spiritand scope of my in vention.

While I have illustrated my invention as embodied in a concrete mixer,it is obvious that various features thereof may be employed in mixingmachines of other forms.

I claim as my invention:

1. In a mixing machine, in combination, a mixing chamber arranged todischarge the mixed materials at one end thereof, said chamber having abottom pivotally supported at one end; means for releasably securing theother end of said bottom in place; and mixing devices in said chamber.

-2. In, a mixing machine, in combination, a mixing chamber arranged todischarge the mixed materials at one. end thereof, said chamber having abottom'section pivotally supported at the other end of said chamber;

means for releasably supporting the opposite end of said bottom section;and mixing devices in said chamber.

3. In a mixing machine, in combination, a mixing chamber comprising afixed section and semicylindrical lower section, said lower sectionbeing pivotally supported at one end; means for releasably supportingthe other end of said lower section; and mixing devices in said chamber.

4. In a mixing machine, in combination, a mixing chamber arranged todischarge the mixed materials at one end thereof, said chamber having abottom section pivotally supported at the other end of said chamber;means for releasably supporting the opposite end of said bottom section;a dumping gate at the discharge end of said chamber; and mixing devicesin said chamber.

5. In a mixing machine, in combination, a supporting framework; a mixingtrough supported at its forward end upon the rear end of said framework;said trough being arranged to discharge the mixed materials at its rearend .and said trough comprising a fixed section and a semicylindricallower section, said lower section being pivotally supported at itsforward end; inclined braces extending from the rear end of saidframework to the rear end of the fixed section of said mixing trough;means for releasably connecting the rear end of the lower section of themixing trough to the upper section thereof; mixing devices in saidtrough; and

a dumping gate at the discharge end of said trough.

JOHN A. SVENSON. Witnesses:

ALICE A. TRILL, MINNIE M. BOLTZ.

